Airworthiness Directive · Amendment 39-14769 · Boeing Model 777-200 and -300 Series Airplanes
Boeing Model 777-200 and -300 Series Airplanes
Superseded. A later AD replaced this one: AD 2016-23-02. Comply with the one in force.
This AD applies to Boeing Model 777-200 and -300 series airplanes, certificated in any category; as identified in Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 777-200 and -300 series airplanes. This AD requires inspecting the lower web of the aft fairing of engine struts for any discoloration and doing any related investigative and corrective action if necessary; inspecting the heat shield castings for any damage and doing any corrective action if necessary; installing gap cover strips; and replacing insulation blankets with new insulation blankets. This AD results from a report that several discolored fairing lower webs and some damaged/deteriorated insulation blankets were found in the aft fairings of engine struts. We are issuing this AD to prevent cracking of lower webs of the aft fairings, which could result in flammable hydraulic fluid leaking onto or near an ignition source, and possibly result in an uncontrollable fire in the engine strut area.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Except as provided by paragraph (g) of this AD: Within 12 months after the effective date of this AD, do the actions specified in paragraphs (f)(1), (f)(2), (f)(3), and (f)(4) of this AD in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006.
(1) Do a general visual inspection of the lower web of the aft fairing for any discoloration and do any related investigative action.
(2) Do a general visual inspection of the heat shield castings for any damage (crack(s), dent(s), gouge(s), warpage, fretting, or missing/loose nutplates).
(3) Install gap cover strips on the heat shield pans.
(4) Replace insulation blankets on the heat shield pans with new insulation blankets.
If any damage, discoloration, heat damage, or crack is found during any inspection required by this AD: Before further flight, do all applicable corrective actions in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, or in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-54-0021, Revision 1, dated March 16, 2006.
Actions done before the effective date of this AD in accordance with Boeing Special Attention Service Bulletin 777-54-0021, dated June 23, 2005, are acceptable for compliance with the requirements of paragraph (f) of this AD, except where the service bulletin does not provide an International Annealed Copper Standard (ICAS) value for determining the results of the inspection for heat damage, the maximum acceptable ICAS value is 42 percent.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
